CN112166152B - Compositions based on ethylene/alpha-olefin/diene interpolymers reinforced with polyvinyl cyclic siloxanes - Google Patents

Compositions based on ethylene/alpha-olefin/diene interpolymers reinforced with polyvinyl cyclic siloxanes Download PDF

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CN112166152B
CN112166152B CN201880093922.8A CN201880093922A CN112166152B CN 112166152 B CN112166152 B CN 112166152B CN 201880093922 A CN201880093922 A CN 201880093922A CN 112166152 B CN112166152 B CN 112166152B
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CN112166152A (en
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孙亚斌
吕博
陈红宇
韩涛
黄剑锋
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Dow Global Technologies LLC
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/16—Elastomeric ethene-propene or ethene-propene-diene copolymers, e.g. EPR and EPDM rubbers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/04—Oxygen-containing compounds
    • C08K5/14—Peroxides
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/54—Silicon-containing compounds
    • C08K5/549—Silicon-containing compounds containing silicon in a ring
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/54—Silicon-containing compounds
    • C08K5/5403—Silicon-containing compounds containing no other elements than carbon or hydrogen
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/54—Silicon-containing compounds
    • C08K5/541—Silicon-containing compounds containing oxygen
    • C08K5/5425—Silicon-containing compounds containing oxygen containing at least one C=C bond
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/54—Silicon-containing compounds
    • C08K5/541—Silicon-containing compounds containing oxygen
    • C08K5/5435—Silicon-containing compounds containing oxygen containing oxygen in a ring

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Abstract

A composition comprising the following components: a) Ethylene/alpha-olefin/non-conjugated diene interpolymers; b) A peroxide; c) At least one polyvinyl cyclic siloxane selected from the following structure 1:structure 1, wherein n is an integer greater than or equal to 1; and each R1 is independently selected from the following: (C) 2 ‑C 4 ) Alkenyl or H 2 C＝C(R 1a )‑C(＝O)‑O‑(CH 2 ) m -, and wherein R is 1a Is H or methyl, and m is an integer from 1 to 4; and each R2 is independently selected from the following: H. (C) 1 ‑C 4 ) Alkyl, (C) 2 ‑C 4 ) Alkenyl, phenyl or H 2 C＝C(R 1b )‑C(＝O)‑O‑(CH 2 ) m -, wherein R is 1b Is H or methyl, and m is an integer from 1 to 4.

Description

Compositions based on ethylene/alpha-olefin/diene interpolymers reinforced with polyvinyl cyclic siloxanes
Background
EPDM-based polymer compositions are used in automotive and infrastructure applications. One target application is a hose for automotive in-hood (UTH) applications, where a higher heat resistance (120/135 ℃ to 150 ℃ for 1008 hours) is required due to the elevated temperature of the UTH, especially for turbocharged engines. Another important application of such EPDM compositions is the manufacture of thermoplastic dynamic vulcanizates (TPV). TPVs are thermoplastic elastomers that contain a thermoplastic continuous phase and a finely dispersed elastomeric phase that cures during the mixing (dynamic vulcanization) process. TPVs have become the material of choice for automotive parts (e.g., body seal profiles and many other products) due to their superior elastic properties, low density, ease of processing and recyclability.
EPDM compositions can be cured by sulfur and peroxide. Peroxide-cured EPDM compounds have better thermal aging resistance than sulfur-cured EPDM. In organic peroxide curing formulations, multifunctional coagents are also used to alter the cure kinetics and final physical properties. Some adjuvants, such as multifunctional acrylates or maleimides with polar bridging groups, have poor solubility in EPDM. These adjuvants create a high local concentration of phase separated domains. Since the peroxides used are also polar in nature, disproportionate amounts of the radicals formed may also be distributed in the auxiliary domains, thereby promoting thermoset "filler-like" particles produced by the radical addition reaction. Such crosslinked networks can produce non-uniform thermal degradation in the composition and final article during heat aging. Thus, there is a need for new EPDM-based compositions containing adjuvants with better solubility and good resistance in EPDM.
Silicone rubber has higher thermal stability than EPDM. Blending silicone rubber in EPDM is one method of improving heat resistance of EPDM. EPDM and silicone, however, are two immiscible materials. Simply physically blending EPDM and silicone will result in a coarse phase morphology and poor properties. The elastomer compositions are described in the following references: US4005254, US4201698, US3859247 and US3946099. However, as discussed above, there remains a need for new EPDM-based compositions that form uniform dispersions of adjuvants and other additives and that have good heat resistance. The following invention has satisfied this need.
Disclosure of Invention
A composition comprising the following components:
a) Ethylene/alpha-olefin/non-conjugated diene interpolymers;
b) A peroxide;
c) At least one polyvinyl cyclic siloxane selected from the following structure 1:
structure 1, wherein n is an integer greater than or equal to 1; and is also provided with
Each R1 is independently selected from the following: (C) 2 -C 4 ) Alkenyl or H 2 C＝C(R 1a )-C(＝O)-O-(CH 2 ) m -, and wherein R is 1a Is H or methyl, and m is an integer from 1 to 4; and is also provided with
Each R2 is independently selected from the following: H. (C) 1 -C 4 ) Alkyl, (C) 2 -C 4 ) Alkenyl, phenyl or H 2 C＝C(R 1b )-C(＝O)-O-(CH 2 ) m -, wherein R is 1b Is H or methyl, and m is an integer from 1 to 4.
Drawings
Fig. 1-9 are bar graphs, each depicting noted mechanical properties (tensile strength, elongation at break). For the comparative and inventive compositions, before and/or after aging, the following is provided. Fig. 1 depicts the tensile strength of examples 1-3 and comparative examples 1-3. FIG. 2 depicts the elongation at break of examples 1-3 and comparative examples 1-3. FIG. 3 depicts the percent retention of elongation at break for examples 1-3 and comparative examples 1-3. Fig. 4 depicts the tensile strength of example 4 and comparative examples 4-6. Fig. 5 depicts the elongation at break of example 4 and comparative example 4. Fig. 6 depicts the percent retention of elongation at break for example 4 and comparative examples 4-6. Fig. 7 depicts the tensile strengths of examples 5-6 and comparative examples 7-9. Fig. 8 depicts the elongation at break of examples 5-6 and comparative examples 7-9. Fig. 9 depicts the percent retention of elongation at break for examples 5-6 and comparative examples 7-9.
Detailed Description
A composition comprising the following components:
a) Ethylene/alpha-olefin/non-conjugated diene interpolymers;
b) A peroxide;
c) At least one polyvinyl cyclic siloxane selected from the following structure 1:
structure 1, wherein n is an integer greater than or equal to 1; and is also provided with
Each R1 is independently selected from the following: (C) 2 -C 4 ) Alkenyl or H 2 C＝C(R 1a )-C(＝O)-O-(CH 2 ) m -, and wherein R is 1a Is H or methyl, and m is an integer from 1 to 4; and is also provided with
Each R2 is independently selected from the following: H. (C) 1 -C 4 ) Alkyl, (C) 2 -C 4 ) Alkenyl, phenyl or H 2 C＝C(R 1b )-C(＝O)-O-(CH 2 ) m -, wherein R is 1b Is H or methyl, and m is an integer from 1 to 4.
The compositions of the present invention have been found to provide good curing properties, good homogeneity and good thermal properties.
The composition may comprise a combination of two or more embodiments described herein.
Each component of the composition may comprise a combination of two or more embodiments as described herein.
In one embodiment or combination of embodiments described herein, the composition further comprises component D selected from silicone rubber or silicone oil. The silicone rubber is solid at room temperature (23 ℃) and at one atmosphere. The silicone oil is liquid at room temperature (23 ℃) and at one atmosphere.
In one embodiment or combination of embodiments described herein, the composition further comprises component D which is a silicone rubber. In further embodiments, the silicone rubber is methyl vinyl silicone rubber (VMQ) or methyl phenyl vinyl silicone (PVMQ).
In one embodiment or combination of embodiments described herein, the composition further comprises component D which is a silicone oil. In further embodiments, the silicone oil is a vinyl-terminated silicone oil.
In one embodiment or combination of embodiments described herein, component D has a weight average molecular weight (Mw) of greater than or equal to 100,000g/mole or greater than or equal to 150,000g/mole or greater than or equal to 200,000g/mole or greater than or equal to 250,000g/mole or greater than or equal to 300,000g/mole or greater than or equal to 350,000g/mole or greater than or equal to 400,000g/mole.
In one embodiment or combination of embodiments described herein, component D has a weight average molecular weight (Mw) of 2,000,000g/mole or 1,800,000g/mole or 1,600,000g/mole or 1,400,000g/mole or 1,200,000g/mole or 1,000,000g/mole or 800,000g/mole or 600,000g/mole.
In one embodiment or combination of embodiments described herein, component D comprises structure (a), as shown below:
(a)wherein m is 1 to 20000, further 10 to 2000, further 20 to 200, and n is 1 to 20000; r1,
(a) R2, R3 and R4 are each independently selected from methyl, phenyl, vinyl or trifluoropropyl, and wherein at least one of R1, R2, R3 and R4 is vinyl.
In one embodiment or combination of embodiments described herein, component D comprises structure (b), as shown below:
(b)wherein m is 1 to 20000, further 10 to 2000, further 20 to 200, and n is 1 to 20000; r1, R2, R3, R4 are each independently an alkyl group, and R1, R2, R3, R4 may be the same alkyl group.
As used herein, with respect to the sign of component D, r1=r 1 And r2=r 2 And so on.
In one embodiment or combination of embodiments described herein, component D comprises a structure selected from the following i) or a structure selected from the following ii):
i)-O-[Si(R)(CH＝CH 2 )]-[Si(R')(R")]-O-, wherein R, R 'and R' are eachIndependently alkyl, and further C1-C6 alkyl, and wherein R, R' and R "may all be the same alkyl;
ii)H 2 C＝CH-[Si(R IV )(R V )]-O-, wherein R IV And R is V Each independently is alkyl, and further C1-C6 alkyl, and wherein R IV And R is V May be the same alkyl group. Here, structure i) represents the internal groups of the silicone rubber polymer molecule, which are bonded to further parts of the polymer molecule at each respective oxygen end group. Structure ii) represents the end groups of the silicone rubber polymer molecule, which are bonded to further parts of the polymer molecule at oxygen end groups.
In one embodiment or combination of embodiments described herein, component D includes a pendant vinyl group and a terminal vinyl group.
In one embodiment or combination of embodiments described herein, component D is a silicone rubber comprising a structure selected from iii):
iii)wherein p is 1 to 20 and q is 2000 to 20000. Here, structure iii) shows examples of pendant vinyl groups and terminal vinyl groups. In structure iii) above, the pendant vinyl groups may be randomly distributed throughout the polymer chain.
In one embodiment or combination of embodiments described herein, component D has a viscosity of ≡10 at 25 ≡C 6 cSt。
Component D may comprise a combination of two or more embodiments as described herein.
In one embodiment or combination of embodiments described herein, the weight ratio of component a to component D is 1.1 to 7.0 or 1.2 to 6.5 or 1.3 to 6.0 or 1.4 to 5.5 or 1.5 to 5.0.
In one embodiment or combination of embodiments described herein, the weight ratio of component a to component D is 1.1 to 5.0 or 1.2 to 4.5 or 1.3 to 4.0 or 1.4 to 3.5 or 1.5 to 3.0.
In one embodiment or combination of embodiments described herein, the weight ratio of component a to component D is 4.0 to 8.0 or 4.5 to 7.5 or 5.0 to 7.0 or 5.5 to 6.5.
In one embodiment or combination of embodiments described herein, n is 1 to 10 or 1 to 8 or 1 to 6 or 1 to 5 or 1 to 4 or 1 to 3 or 1 to 2 for structure C. In further embodiments, n=1.
In one embodiment or combination of embodiments described herein, for structure C, each R2 is independently H or (C 1 -C 4 ) Alkyl, and further (C) 1 -C 4 ) An alkyl group.
In one embodiment or combination of embodiments described herein, for structure C, each R1 is independently (C 2 -C 4 ) Alkenyl, and further (C 2 ) Alkenyl groups.
As used herein, with respect to the sign of component C, r1=r 1 And r2=r 2 。
In one embodiment or combination of embodiments described herein, structure 1 of component C is selected from the following structures 1a:
structure 1a wherein subscript n is an integer greater than or equal to 1; each R1 is independently (C) 2 -C 4 ) Alkenyl, and each R2 is independently H, (C) 1 -C 4 ) Alkyl, (C) 2 -C 4 ) Alkenyl or phenyl.
In one embodiment or combination of embodiments described herein, structure 1 is selected from the following structures 1b:
structure 1b, wherein subscript n is an integer greater than or equal to 1 and each R2 is independently H, (C) 1 -C 4 ) Alkyl, (C) 2 -C 4 ) Alkenyl or phenyl.
In one embodiment or combination of embodiments described herein, structure 1 is selected from the following structures 1c:
structure 1c.
In one embodiment or combination of embodiments described herein, component C is selected from vinyl-D3, vinyl-D4, and vinyl-D5, or combinations thereof.
In one embodiment or combination of embodiments described herein, the weight ratio of component a to component C is 10 to 80 or 15 to 75 or 20 to 70.
In one embodiment or combination of embodiments described herein, the weight ratio of component a to component C is 20 to 80 or 25 to 75 or 30 to 70.
In one embodiment or combination of embodiments described herein, component C is present in an amount of 0.80wt% to 4.00wt% or 0.80wt% to 3.80wt% or 0.80wt% to 3.60wt% or 0.85wt% to 3.40wt% or 0.85wt% to 3.20wt% or 0.90wt% to 3.10wt% by weight of the composition.
In one embodiment or combination of embodiments described herein, component a is present in an amount of 36wt% to 70wt%, or 38wt% to 68wt%, or 40wt% to 66wt%, or 42wt% to 64wt%, or 43wt% to 63wt%, by weight of the composition.
In one embodiment or combination of embodiments described herein, the ethylene/a-olefin/non-conjugated diene interpolymer of component a is EPDM.
In one embodiment or combination of embodiments described herein, the density of component a is 0.850g/cc to 0.890g/cc or 0.852g/cc to 0.885g/cc or 0.855g/cc to 0.880g/cc or 0.858g/cc to 0.875g/cc or 0.858g/cc to 0.870g/cc or 0.858g/cc to 0.865g/cc (1 cc = 1 cm) 3 )。
In one embodiment or combination of embodiments described herein, the mooney viscosity (ml1+4, 125 ℃) of component a is 20 to 60 or 25 to 55 or 30 to 50 or 35 to 45.
In one embodiment, the melt index (I2) of component A is 0.5g/10min to 5.0g/10min or 1.0g/10min to 4.0g/10min or 1.0g/10min to 3.0g/10min or 1.0g/10min to 2.0g/10min (190 ℃ and 2.16 kg).
In one embodiment or combination of embodiments described herein, the composition further comprises component E selected from ZnO and/or MgO, and further ZnO.
In one embodiment or combination of embodiments described herein, the weight ratio of component a to component E is 5.0 to 12 or 6.0 to 11 or 7.0 to 10.
In one embodiment or combination of embodiments described herein, the composition further comprises component F selected from one or more fillers. In further embodiments, component F is silica or carbon black.
In one embodiment or combination of embodiments described herein, the weight ratio of component a to component F is 2.4 to 6.2 or 2.6 to 6.0 or 2.8 to 5.8.
In one embodiment or combination of embodiments described herein, the composition comprises component F in an amount of 5.0wt% to 60wt% or 10wt% to 50wt% or 15wt% to 45wt% or 20wt% to 40wt% or 25wt% to 35wt% by weight of the composition.
In one embodiment or combination of embodiments described herein, the composition comprises ≡90wt% or ≡92wt% or ≡94wt% or ≡96wt% or ≡98wt% or ≡99wt% of component a, based on the weight of all olefin-based polymers present in the composition.
In one embodiment or combination of embodiments described herein, the composition comprises 80wt% or greater than 85wt% or greater than 90wt% or greater than 95wt% or greater than 98wt% or greater than 99wt% of component A, based on the weight of all polymers present in the composition.
In one embodiment or combination of embodiments described herein, component a is the only olefin-based polymer present in the composition.
In one embodiment or combination of embodiments described herein, component B is selected from dicumyl peroxide (DCP) or a, a' -bis (t-butylperoxy) -diisopropylbenzene (BIBP).
In one embodiment or combination of embodiments described herein, the composition comprises component B in an amount of 0.1wt% to 10wt% or 0.5wt% to 9.0wt% or 1.0wt% to 8.0wt% by weight of the composition.
In one embodiment or combination of embodiments described herein, the composition includes a silane coupling agent, such as vinyltris (2-methoxy-ethoxy) silane (SILQUEST A-172 NT). In further embodiments, the silane coupling agent is present in an amount of 0.1wt% to 10wt% or 0.5wt% to 8.0wt% or 1.0wt% to 6.0wt% or 2.0wt% to 4.0wt% based on the weight of the composition.
In one embodiment or combination of embodiments described herein, the composition includes one or more stabilizers, for example, 2, 4-trimethyl-1, 2-dihydroquinoline polymer (vulkatox HS/LG), zinc-4-and-5-methyl-2-mercapto-benzimidazole (vulkatox ZMB 2). In further embodiments, the one or more stabilizers are present in an amount of 0.5wt% to 10wt% or 1.0wt% to 8.0wt% or 1.5wt% to 6.0wt% or 2.0wt% to 4.0wt% by weight of the composition.
In one embodiment or combination of embodiments described herein, the composition comprises a paraffinic oil, such as SUNOCO sunbar 2280.
In one embodiment or combination of embodiments described herein, the composition comprises one or more adjuvants. In further embodiments, the one or more adjuvants are present in an amount of 0.2wt% to 5.0wt% or 0.4wt% to 4.5wt% or 0.6wt% to 4.0wt% or 0.8wt% to 3.5wt% or 1.0wt% to 3.0wt% by weight of the composition.
In one embodiment or combination of embodiments described herein, the composition comprises, by weight of the composition, the sum of component A, component B, and component C, and optionally component D, is ≡60wt% or ≡65wt% or ≡70wt% or ≡75wt% or ≡80wt%, 85wt% or ≡90wt% or ≡95wt% or ≡98wt% or ≡99wt%.
In one embodiment or combination of embodiments described herein, the composition comprises the sum of component A, component B and component C and component D being ≡60wt% or ≡65wt% or ≡70wt% or ≡75wt% or ≡80wt% ≡85wt% or ≡90wt% or ≡95wt% or ≡98wt% or ≡99wt%, by weight of the composition.
In one embodiment or combination of embodiments described herein, the composition comprises 1.00wt% or 0.50wt% or 0.20wt% or 0.10wt% or 0.05wt% styrene block copolymer or terpolymer (e.g., SES, SBS, SEP, etc.), based on the weight of the composition. In one embodiment, the composition does not include a styrene block copolymer or terpolymer (e.g., SES, SBS, SEP, etc.).
In one embodiment or combination of embodiments described herein, the composition comprises 1.00wt% or 0.50wt% or 0.20wt% or 0.10wt% or 0.05wt% polystyrene, based on the weight of the composition. In one embodiment, the composition does not include polystyrene.
In one embodiment or combination of embodiments described herein, the composition comprises less than or equal to 50wt% or less than or equal to 40wt% or less than or equal to 30wt% or less than or equal to 20wt% or less than or equal to 10wt% EVA, based on the weight of the composition.
In one embodiment or combination of embodiments described herein, the composition comprises 1.00wt% or less than 0.50wt% or less than 0.20wt% or less than 0.10wt% or less than 0.05wt% EVA, based on the weight of the composition. In one embodiment, the composition does not include EVA.
In one embodiment or combination of embodiments described herein, the composition comprises 1.00wt% or 0.50wt% or 0.20wt% or 0.10wt% or 0.05wt% polyamide, based on the weight of the composition. In one embodiment, the composition does not include a polyamide.
In one embodiment or combination of embodiments described herein, the composition comprises 1.00wt% or 0.50wt% or 0.20wt% or 0.10wt% or 0.05wt% polypropylene homopolymer, based on the weight of the composition. In one embodiment, the composition does not include a polypropylene homopolymer.
In one embodiment or combination of embodiments described herein, the composition comprises less than or equal to 25wt% or less than or equal to 20wt% or less than or equal to 15wt% or less than or equal to 10wt% or less than or equal to 5.0wt% of the propylene-based copolymer, based on the weight of the composition. In one embodiment, the composition does not include a propylene-based copolymer.
In one embodiment or combination of embodiments described herein, the composition comprises 1.00wt% or 0.50wt% or 0.20wt% or 0.10wt% or 0.05wt% propylene-based copolymer, based on the weight of the composition. In one embodiment, the composition does not include a propylene-based copolymer.
In one embodiment or combination of embodiments described herein, the composition comprises 25wt% or less than 20wt% or less than 15wt% or less than 10wt% or less than 5.0wt% propylene/ethylene copolymer, based on the weight of the composition. In one embodiment, the composition does not include a propylene/ethylene copolymer.
In one embodiment or combination of embodiments described herein, the composition comprises 1.00wt% or 0.50wt% or 0.20wt% or 0.10wt% or 0.05wt% propylene/ethylene copolymer, based on the weight of the composition. In one embodiment, the composition does not include a propylene/ethylene copolymer.
Also provided is a crosslinking composition formed from the composition of any one or more of the embodiments described herein.
In one embodiment or combination of embodiments described herein, the composition has a tensile strength of ≡4.0MPa or ≡4.5MPa or ≡5.0MPa.
In one embodiment, the elongation at break of the composition is 100% to 200%.
The compositions of the present invention may comprise a combination of two or more embodiments as described herein.
Also provided is an article comprising at least one component formed from a composition of one or more of the compositions described herein.
The article of manufacture may comprise a combination of two or more embodiments as described herein.
Summary of some embodiments
a) As discussed above, a composition is provided that includes the following components:
a) Ethylene/alpha-olefin/non-conjugated diene interpolymers;
b) A peroxide;
c) At least one polyvinyl cyclic siloxane selected from the following structure 1:
structure 1, wherein n is an integer greater than or equal to 1;
and each R1 is independently selected from the following: (C) 2 -C 4 ) Alkenyl or H 2 C＝C(R 1a )-C(＝O)-O-(CH 2 ) m -, and wherein R is 1a Is H or methyl, and m is an integer from 1 to 4; and is also provided with
Each R2 is independently selected from the following: H. (C) 1 -C 4 ) Alkyl, (C) 2 -C 4 ) Alkenyl, phenyl or H 2 C＝C(R 1b )-C(＝O)-O-(CH 2 ) m -, wherein R is 1b Is H or methyl, and m is an integer from 1 to 4.
b) The composition according to a) above, wherein the composition further comprises a component D selected from silicone rubber or silicone oil, and further comprises one or more vinyl-based silicone rubbers or silicone oils comprising one or more vinyl-based groups.
c) The composition according to a) or b) above, wherein said structure 1 of component C is selected from the following structures 1a:
structure 1a wherein subscript n is an integer greater than or equal to 1; each R1 is independently (C) 2 -C 4 ) Alkenyl, further (C 2 -C 3 ) Alkenyl, further (C 2 ) Alkenyl, and each R2 is independently H, (C) 1 -C 4 ) Alkyl group,(C 2 -C 4 ) Alkenyl or phenyl, further H or (C 1 -C 4 ) Alkyl, further (C) 1 -C 4 ) An alkyl group.
d) The composition according to any one of the above a) to C), wherein said structure 1 of component C is selected from the following structures 1b:
structure 1b, wherein subscript n is an integer greater than or equal to 1 and each R2 is independently H, (C) 1 -C 4 ) Alkyl, (C) 2 -C 4 ) Alkenyl or phenyl, further H or (C 1 -C 4 ) Alkyl, further (C) 1 -C 4 ) An alkyl group.
e) The composition according to any one of the above a) to d), wherein the weight ratio of component a to component C is from 10 to 80.
f) The composition according to any one of the above a) to e), wherein component a is present in an amount of 36wt% to 70wt%, or 38wt% to 68wt%, or 40wt% to 66wt%, or 42wt% to 64wt%, or 43wt% to 63wt%, based on the weight of the composition.
g) The composition according to any one of the above a) to f), wherein the ethylene/a-olefin/non-conjugated diene interpolymer of component a is EPDM.
h) The composition according to any one of the above a) to g), wherein the composition comprises as the sole olefin-based polymer present in the composition, not less than 90% by weight or not less than 92% by weight or not less than 95% by weight or not less than 98% by weight or not less than 99% by weight of component A.
i) The composition according to any of the above a) to h), wherein the weight ratio of component a to component D is 1.1 to 7.0 or 1.2 to 6.5 or 1.3 to 6.0 or 1.4 to 5.5 or 1.5 to 5.0.
j) The composition according to any one of the above a) to i), wherein the weight ratio of component a to component D is 1.1 to 5.0 or 1.2 to 4.5 or 1.3 to 4.0 or 1.4 to 3.5 or 1.5 to 3.0.
k) The composition according to any one of the above a) to j), wherein the weight ratio of component a to component D is 4.0 to 8.0 or 4.5 to 7.5 or 5.0 to 7.0 or 5.5 to 6.5.
l) the composition according to any of the above a) to k), wherein the weight ratio of component A to component C is from 10 to 80 or from 15 to 75 or from 20 to 70.
m) the composition according to any of the above a) to l), wherein the weight ratio of component A to component C is 20 to 80 or 25 to 75 or 30 to 70.
n) the composition according to any one of the above a) to m), wherein component C is present in an amount of 0.80wt% to 4.00wt% or 0.80wt% to 3.80wt% or 0.80wt% to 3.60wt% or 0.85wt% to 3.40wt% or 0.85wt% to 3.20wt% or 0.90wt% to 3.10wt%, based on the weight of the composition.
o) the composition according to any one of the above a) to n), wherein component a is present in an amount of 36wt% to 70wt%, or 38wt% to 68wt%, or 40wt% to 66wt%, or 42wt% to 64wt%, or 43wt% to 63wt%, by weight of the composition.
p) the composition according to any one of the above a) to o), wherein the density of component A is from 0.850g/cc to 0.890g/cc or from 0.852g/cc to 0.885g/cc or from 0.855g/cc to 0.880g/cc or from 0.858g/cc to 0.875g/cc or from 0.858g/cc to 0.870g/cc or from 0.858g/cc to 0.865g/cc (1 cc=1 cm) 3 )。
q) the composition according to any of the above a) to p), wherein the Mooney viscosity (ML 1+4, 125 ℃) of component A is from 20 to 60 or from 25 to 55 or from 30 to 50 or from 35 to 45.
r) the composition according to any of the above a) to q), wherein the melt index (I2) of component A is 0.5g/10min to 5.0g/10min or 1.0g/10min to 4.0g/10min or 1.0g/10min to 3.0g/10min or 1.0g/10min to 2.0g/10min (190 ℃ and 2.16 kg).
s) the composition according to any one of the above a) to r), wherein the composition further comprises a component E selected from ZnO and/or MgO, and further ZnO.
t) a composition according to any of the above a) to s), wherein the weight ratio of component a to component E is 5.0 to 12 or 6.0 to 11 or 7.0 to 10.
u) the composition according to any one of the above a) to t), wherein the composition further comprises a component F selected from one or more fillers. In further embodiments, component F is silica or carbon black.
v) a composition according to any one of the above a) to u), wherein the weight ratio of component a to component F is 2.4 to 6.2 or 2.6 to 6.0 or 2.8 to 5.8.
w) the composition according to any one of the above a) to v), wherein the composition comprises component F in an amount of 5.0 to 60wt% or 10 to 50wt% or 15 to 45wt% or 20 to 40wt% or 25 to 35wt% by weight of the composition.
x) the composition according to any one of the above a) to w), wherein the composition comprises not less than 90% by weight or not less than 92% by weight or not less than 94% by weight or not less than 96% by weight or not less than 98% by weight or not less than 99% by weight of component A, based on the weight of all olefin-based polymers present in the composition.
y) the composition according to any one of the above a) to x), wherein the composition comprises not less than 80% by weight or not less than 85% by weight or not less than 90% by weight or not less than 95% by weight or not less than 98% by weight or not less than 99% by weight of the total polymers present in the composition.
z) the composition according to any of the above a) to y), wherein the composition comprises, based on the weight of the composition, the sum of component A, component B and component C and optionally component D, equal to or greater than 60wt% or equal to or greater than 65wt% or equal to or greater than 70wt% or equal to or greater than 75wt% or equal to or greater than 80wt%, equal to or greater than 85wt% or equal to or greater than 90wt% or equal to or greater than 95wt% or equal to or greater than 98wt% or equal to 99wt%.
aa) the composition according to any one of the above a) to z), wherein the composition comprises, based on the weight of the composition, the sum of component A, component B and component C and component D, equal to or greater than 60 wt.% or equal to or greater than 65 wt.% or equal to or greater than 70 wt.% or equal to or greater than 75 wt.% or equal to or greater than 80 wt.%, equal to or greater than 85 wt.% or equal to or greater than 90 wt.% or equal to or greater than 95 wt.% or equal to or greater than 98 wt.% or equal to 99 wt.%.
bb) the composition according to any of the above a) to aa), wherein for structure C n is 1 to 10 or 1 to 8 or 1 to 6 or 1 to 5 or 1 to 4 or 1 to 3 or 1 to 2. In further embodiments, n=1.
cc) the composition according to any one of a) to bb) above, wherein for structure C, each R2 is independently H or (C) 1 -C 4 ) Alkyl, and furtherWalking floor (C) 1 -C 4 ) An alkyl group.
dd) the composition according to any one of the above a) to cc), wherein for structure C, each R1 is independently (C) 2 -C 4 ) Alkenyl, and further (C 2 ) Alkenyl groups.
ee) the composition according to any one of the above a) to dd), wherein the composition further comprises component D, and component D comprises one or more vinyl groups.
ff) the composition according to any one of the above a) to ee), wherein the composition further comprises a component D selected from silicone rubbers, and further comprising one or more vinyl-based silicone rubbers.
gg) the composition according to any one of the above a) to ee), wherein the composition further comprises a component D selected from silicone oils, and further comprising one or more vinyl silicone oils.
hh) also provides a crosslinking composition formed from the composition of any one of a) to gg) above, wherein
ii) also provides an article comprising at least one component formed from the composition of any one of a) to hh) above.
Additive agent
The compositions of the present invention may contain one or more additives. Additives include, but are not limited to, antioxidants, ultraviolet light absorbers, antistatic agents, pigments, viscosity modifiers, antiblocking agents, mold release agents, fillers, coefficient of friction (COF) modifiers, induction heated particles, odor modifiers/absorbers, and any combination thereof.
Definition of the definition
Unless stated to the contrary, implicit from the context or customary in the art, all parts and percentages are by weight and all test methods are current methods by the filing date of this disclosure.
As used herein, the term "composition" includes one or more materials including the composition as well as reaction products and decomposition products formed from the materials of the composition.
The term "comprising" and derivatives thereof is not intended to exclude the presence of any additional component, step or procedure, whether or not the same is disclosed herein. For the avoidance of any doubt, unless stated to the contrary, all compositions claimed herein through use of the term "comprising" may contain any additional additive, adjuvant or compound, whether in polymerized or other form. In contrast, the term "consisting essentially of excludes any other component, step, or procedure from any subsequently recited range, except those that are not essential to operability. The term "consisting of excludes any component, step or procedure not explicitly depicted or listed.
As used herein, the term "polymer" refers to a polymeric compound prepared by polymerizing the same or different types of monomers. Thus, the generic term polymer encompasses the term homopolymer (used to refer to polymers prepared from only one type of monomer, it being understood that trace amounts of impurities may be incorporated into the polymer structure) and the term interpolymer as defined below. Trace impurities may be incorporated into and/or within the polymer.
As used herein, the term "interpolymer" refers to a polymer prepared by the polymerization of at least two different types of monomers. Thus, the generic term interpolymer includes copolymers (used to refer to polymers prepared from two different types of monomers) as well as polymers prepared from more than two different types of monomers.
As used herein, the term "olefin-based polymer" refers to a polymer that includes 50wt% or major amount of an olefin monomer, such as ethylene or propylene (based on the weight of the polymer), and optionally may include one or more comonomers, in polymerized form.
As used herein, the term "ethylene-based polymer" refers to a polymer that includes 50wt% or majority weight percent polymerized ethylene monomer (based on the total weight of the polymer) and optionally may include at least one polymerized comonomer.
As used herein, the term "ethylene/a-olefin/non-conjugated diene interpolymer" refers to an interpolymer that comprises, in polymerized form, ethylene monomer (by weight of the interpolymer), a-olefin, and a non-conjugated diene. In one embodiment, the interpolymer comprises a substantial amount of ethylene.
As used herein, the term "propylene-based copolymer" refers to a polymer that includes, in polymerized form, a significant amount of propylene monomer (based on the total weight of the polymer) and comonomer as the sole monomer type.
As used herein, the term "propylene/ethylene-based copolymer" refers to a polymer that includes, in polymerized form, a significant amount of propylene monomer (based on the total weight of the polymer) and ethylene as the sole monomer types.
As used herein, the term "cross-linking" means that at least 50wt%, further at least 60wt%, of the composition remains undissolved after refluxing in xylene for 12 hours at a temperature of 140 ℃ (boiling point of xylene, reflux). See ASTM D2765.
Test method
GPC-Silicone rubber
The chromatographic apparatus consisted of a Waters 2695 separation module equipped with a vacuum degasser and a Waters 2414 refractive index detector. Three STYRAGEL HR columns (300 mm. Times.7.8 mm) (molecular weight separation range 100 to 4,000,000) were used and then separated by STYRAGEL guard column (30 mm. Times.4.6 mm). Analysis was performed using authentication grade toluene flowing at 1.0mL/min as eluent and both column and detector were heated to 45 ℃. Samples (0.5% wt/v) were prepared by weighing about 0.025g of neat sample in a 12-mL glass vial and diluting with about 5mL toluene. After filtration through a 0.45 μm PTFE filter, the sample solution was transferred to a glass autosampler bottle. An injection volume of 100uL was used and data was collected for 38 minutes. Data collection and analysis was performed using Waters Empower GPC software. The average molecular weight was determined relative to a calibration curve (3 rd order) created using polystyrene standards having molecular weights ranging from 370-1,270,000 g/mole.
Melt index
Melt index (or I2, I) of ethylene-based polymers measured according to ASTM-D1238 at 190℃C 2.16kg 2 Or MI), andreported in grams eluted every 10 minutes.
DSC standard method
Differential Scanning Calorimetry (DSC) is used to measure the crystallinity of ethylene-based polymer (PE or OBC) samples and propylene-based polymer (PP) samples. About five to eight milligrams of sample are weighed and placed in a DSC pan. The lid is screwed onto the disc to ensure a closed atmosphere. The sample pan was placed in a DSC unit and then heated to a temperature of 180 ℃ (for ethylene-based polymer samples) at a rate of about 10 ℃/min (to 230 ℃ for propylene-based polymer samples). The sample was held at this temperature for three minutes. The sample was then cooled to-60 ℃ (for ethylene-based polymer samples) (to-40 ℃ for propylene-based polymer samples) at a rate of 10 ℃/min and held isothermally at that temperature for three minutes. The sample was then heated at a rate of 10 c/min until it was completely melted (second heating). By the heat of fusion (H) determined from the second heating profile f ) The theoretical heat of fusion (165J/g for the propylene-based polymer sample) divided by 292J/g (for the ethylene-based polymer sample) and this number multiplied by 100 to calculate the percent crystallinity (e.g., percent crystallinity = (H for the ethylene-based polymer sample) f 292J/g). Times.100; and for propylene-based polymer samples, crystallinity = (H f /165J/g)×100)。
According to the second heating curve (peak T m ) To determine one or more melting points (T) m ). According to a first cooling curve (peak T c ) Determination of the crystallization temperature (T) c )。
Experiment
Material
NORDEL IP 3640EPDM, from Dow chemical company (The DOW Chemical Company), mooney viscosity (ML 1+4, 125 ℃) =40 (ASTM D1646) and density=0.86 g/cc (ASTM D297).
Methyl vinyl silicone rubber (VMQ): XIAMETER RBB-2002-50 from Dow chemical company.
Vinyl-terminated silicone oil: the viscosity at 25℃is 100 mPas and the vinyl content is 3.1 to 3.6mol% and is commercially available from Shaoxing Seagaku chemical company (Shao Xing Li Jie Hua Gong Corp.).
Table 1 lists other additives.
Table 1: additive agent
Formulation (composition)
Mixing and compounding
EPDM, silicone rubber (or silicone oil), silica, znO, peroxide, auxiliaries and other additives were mixed in a HAAKE mixer at 80 ℃ for 10 minutes at a rotor speed of 60 rpm. After mixing, each composition was further compressed for two minutes at 80 ℃ and cold pressed at a pressure of 10MPa to an uncured sheet of approximately "2mm thick".
Compression molding
Each uncured sheet was further molded into a "150mm x 70mm x 2mm" sized plate and simultaneously cured in a thermo-compression machine at 180 ℃ for 10 minutes at a pressure of 10 MPa. Test samples were die cut from the cured plaques according to ASTM D412. The cured samples were conditioned at room temperature and ambient atmosphere for at least 24 hours prior to testing. See tables 2-4 for compositions and related properties.
MDR test
MDR cure properties of each formulation were measured according to ASTM D-5289 using Alpha Technologies MDR 2000. A4.5 g sample was cut from the uncured sheet and placed in an MDR holder. MDR testing was performed at 180℃for a period of 30 minutes at an oscillation frequency of 100CPM (1.67 Hz) and an oscillation angle of 0.5 degrees (7% strain). During the test interval, the minimum torque (ML) and maximum torque (MH) measured by the MDR are reported in dNm units. The difference between MH and ML indicates the degree of crosslinking, wherein a larger difference reflects a greater degree of crosslinking. The time required for the torque to reach equilibrium is reported in minutes. The time required to increase from the minimum torque by one (ts 1) or two (ts 2) points is recorded in minutes. the ts1 and ts2 values represent the time required to begin the crosslinking process. The shorter time indicates faster crosslinking rate. The results are shown in tables 2-4 below, and the following notations are used:
MH (maximum torque): highest torque recorded in plateau curve;
MH-ML: the difference between the maximum torque and the minimum torque is related to the crosslink density of the cured material;
ts2 (sensing time): after reaching the minimum torque (ML), during the curing phase, as the torque increases, care needs to be taken to:
ts2 is the scorch time for the viscosity to rise two units higher than ML;
tc90 (optimal cure time is the time at which 90% cure occurs); and is also provided with
CRI: cure rate index = 100/(tc 90-ts 2), is a measure of the linear slope of the rising curve.
Thermal aging
The samples were aged in a hot-air oven at 180℃for one day (24 hours), two days (48 hours) and three days (72 hours). Tensile properties were measured as discussed below.
Tensile testing
Tensile properties of the cured test specimens and the aged test specimens were obtained according to ASTM D412 test (dumbbell test specimens). The results are shown in tables 2-4 below. Three samples were analyzed and the average value reported.
Results
Table 2 shows the compositions and cure kinetics data for examples 1-3 and comparative examples 1-3. In this set of examples, "1.5phr of auxiliary" was used in example 1 and comparative examples 1-3, and "3phr and 5phr of vinyl-D4" were used in examples 2 and 3, respectively. The inventive composition (vinyl-D4 as curing aid) shows similar curing behaviour (scorch time, crosslink density, cure rate) as comparative example 1 containing SARET 517 and comparative example 2 containing TAIC, each at the same 1.5phr load. Comparative example 3 containing HVA-2 shows the lowest MH-ML (crosslinking density). Increasing the vinyl-D4 loading from 1.5phr to 3phr and 5phr increases MH-ML (crosslink density), indicating that vinyl-D4 is an effective adjunct for peroxide curing of EPDM.
The tensile properties of the initial and heat aged samples of examples 1-3 and comparative examples 1-3 are summarized in FIGS. 1-3. Compositions containing vinyl-D4 showed slightly lower initial Tensile Strength (TS) than compositions containing SARET 517 or TAIC, but similar or higher tensile strength than compositions containing HVA-4. After aging for one day at 180 ℃, all the compositions showed a decrease in tensile strength, but the compositions containing vinyl-D4 showed a higher tensile strength compared to the compositions containing SARET 517 or HVA-2, and similar tensile strengths to TAIC. As the stiffness increases, the tensile strength increases with further aging.
Elongation at break (EB) is an important indicator for evaluating the heat resistance of cured EPDM compositions. Typically, elongation at break will decrease after heat aging. The higher the retention of elongation, the better the heat resistance of the material. After aging for one day at 180 ℃, the inventive composition (vinyl-D4) showed a higher retention of elongation than the compositions containing SARET 517 or HVA-2, and a slightly higher retention than the compositions containing TAIC (examples 1 and 2). As shown by the MDR data, increasing the vinyl-D4 loading to 3phr and 5phr reduced the initial elongation due to the increased crosslink density, however the use of a "3phr loading" still provided an overall higher elongation after aging than compositions containing SARET 517 or HVA-2.
Table 2: examples 1 to 3 and comparative examples 1 to 3 (parts by weight)
Table 3 sets forth the compositions and cure kinetics data for inventive example 4 and comparative examples 4-6. See also fig. 4-6. In this set of examples, the adjuvant load has equimolar double bonds present in the final composition. Compositions containing vinyl-D4 showed similar scorch times compared to compositions containing SARET 517 or TAIC, and Cure Rates (CRI) were higher compared to compositions containing SARET 517 or TAIC. Among the four adjuvants examined, the HVA-2-containing compositions showed the shortest scorch time and the highest cure rate. All four examples show similar crosslink densities.
The tensile properties of the initial and heat aged samples of example 4 and comparative examples 4-6 are summarized in fig. 4 to 6. The compositions containing vinyl-D4 showed the highest elongation retention after heat aging.
Table 3: example 4 and comparative examples 4 to 6 (parts by weight)
Comparative example 4 Comparative example 5 Comparative example 6 Inventive example 4
EPDM(NORDEL IP 3640) 100 100 100 100
Silicon dioxide (VN 3) 35 35 35 35
Silane (Silquest A-172 NT) 2 2 2 2
ZnO 10 10 10 10
PEG(PEG 4000) 2 2 2 2
Stabilizers (Vulkanox HS/LG 1) 1 1 1 1
Stabilizer (Vulkanox ZMB 2) 1 1 1 1
Peroxide (DCP 40%) 8 8 8 8
Auxiliary agent (SARET 517) 1.96
Auxiliary agent (TAIC) 1.45
Auxiliary agent (HVA-2) 2.33
Auxiliary agent (vinyl-D4) 1.50
Double bond mmol 17.4 17.4 17.4 17.4
ML，dNm 3.71 3.52 3.84 3.50
MH，dNm 36.58 38.98 39.23 37.44
MH-ML，dNm 32.87 35.46 35.39 33.94
ts2, min 0.30 0.32 0.25 0.33
tc90, min 2.79 2.70 2.38 2.57
CRI 40.16 42.02 46.95 44.64
Initial TS (MPa) 7.18 5.65 6.44 5.33
Initial EB (%) 205.81 146.37 163.01 151.79
180 ℃,1 day, TS (MPa) 1.44 2.41 3.16 2.88
180 ℃,1 day, EB (%) 56.99 67.38 85.97 87.59
180 ℃,2 days, TS (MPa) 2.48 2.14 1.41 1.96
180 ℃,2 days, EB (%) 1.14 23.52 6.08 27.44
180 ℃, EB retention rate of 1 day 27.7％ 46.0％ 52.7％ 57.7％
EB retention rate at 180℃for 2 days 0.6％ 16.1％ 3.7％ 18.1％
Table 4 sets forth compositions and cure kinetics data for examples 5-6 and comparative examples 7-9. Comparative examples 7 and 8 and inventive example 5 are blends of EPDM and methyl vinyl silicone rubber (VMQ). Comparative example 7 contains no curing aid. Comparative example 8 contains TAIC as a curing aid. Example 5 contains vinyl-D4 as curing aid. Comparative example 9 and inventive example 6 are blends of EPDM and vinyl-terminated silicone oil. Comparative example 9 contains no curing aid and example 6 contains vinyl-D4 as curing aid.
Table 4: examples 5 to 6 and comparative examples 7 to 9 (parts by weight)
The tensile properties of the initial and heat aged samples of examples 5-6 and comparative examples 7-9 are summarized in FIGS. 7-9. EPDM/VMQ compositions without or with TAIC as an adjunct show a significant decrease in tensile strength and elongation after aging. EPDM/VMQ compositions containing vinyl-D4 as an adjunct showed significantly less decrease in tensile strength and elongation. This indicates that the addition of vinyl-D4 improves the heat resistance of the EPDM/VMQ composition. In a similar manner, vinyl-D4 also improves the heat resistance of the EPDM/vinyl silicone oil composition.
Solubility study
NORDEL IP 3722: ethylene propylene diene terpolymer (EPDM) characterized by a density of 0.87g/cc (ASTM D297) and a mooney viscosity (ML 1+4 at 125 ℃) of 20 (ASTM D1646), and is commercially available from dow chemical company.
Solubility test method
About 1.5-1.6 grams (g) of NORDEL IP 3722 pellets were placed into an unused "25mL" clear glass bottle. TAIC (6 mL) or ViD4 (6 mL) is then added to the bottle and the resin pellet is suspended in the liquid. The resulting mixture was then sealed and kept at room temperature (23 ℃) for four days to achieve complete liquid absorption. The pellet was removed from the bottle and the pellet surface was thoroughly wiped with a paper towel until no wet spot of used paper was observed. The wiped pellet was then weighed and the weight recorded. The results are shown in table 5. As shown in this table, the invention example (ViD 4) shows a significant increase in weight compared to the comparative example (TAIC). This increase in weight indicates a higher amount of adjuvant (ViD 4) absorbed into the polymer (EPDM) pellet. The higher absorption indicates that the ViD adjuvant has better (improved) solubility in EPDM than the TAIC adjuvant. The improved solubility allows for better uniform dispersion of the adjunct in the EPDM, which should provide better crosslink density and better physical properties (e.g., tensile and elongation).
TABLE 5
X1=pre-soak pellet weight;
x2=pellet weight after soaking;
x2-x1 = pellet weight change;
[ (X2-X1)/X1 ] =100% of pellet weight change (%).

Claims (10)

1. A composition comprising the following components:
a) Ethylene/alpha-olefin/non-conjugated diene interpolymers;
b) A peroxide;
c) At least one polyvinyl cyclic siloxane selected from the following structure 1:
wherein n is an integer greater than or equal to 1; and each R 1 Independently selected from the following: c (C) 2 -C 4 Alkenyl or H 2 C＝C(R 1a )-C(＝O)-O-(CH 2 ) m -, and wherein R is 1a Is H or methyl, and m is an integer from 1 to 4; and is also provided with
Each R 2 Independently selected from the following: H. c (C) 1 -C 4 Alkyl, C 2 -C 4 Alkenyl, phenyl or H 2 C＝C(R 1b )-C(＝O)-O-(CH 2 ) m -, wherein R is 1b Is H or methyl, and m is an integer from 1 to 4.
2. The composition of claim 1, wherein the composition further comprises component D selected from silicone rubber or silicone oil.
3. The composition according to any one of claims 1-2, wherein the structure 1 of component C is selected from the following structures 1a:
wherein the subscript n is an integer greater than or equal to 1; each R 1 Independently C 2 -C 4 Alkenyl, and each R 2 H, C independently 1 -C 4 Alkyl, C 2 -C 4 Alkenyl or phenyl.
4. The composition according to any one of claims 1-2, wherein the structure 1 of component C is selected from the following structures 1b:
wherein the subscript n is an integer greater than or equal to 1 and each R 2 H, C independently 1 -C 4 Alkyl, C 2 -C 4 Alkenyl or phenyl.
5. The composition of any one of claims 1-2, wherein the weight ratio of component a to component C is from 10 to 80.
6. The composition of any one of claims 1-2, wherein component a is present in an amount of 36wt% to 70wt%, based on the weight of the composition.
7. The composition of any of claims 1-2, where the ethylene/a-olefin/non-conjugated diene interpolymer of component a is EPDM.
8. The composition of any of claims 1-2, wherein the composition comprises ≡90wt% of component a as the only olefin-based polymer present in the composition.
9. A crosslinking composition formed from the composition of any one of claims 1-8.
10. An article comprising at least one component formed from the composition of any one of claims 1-9.
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